Sunken tub



FIG. 1 is a top plan view of a sunken tub showing my new design;

FIG. 2 is a cross sectional view taken on line 2--2 of FIG. 1;

FIG. 3 is a left end elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right end elevational view thereof; and

FIG. 6 is a front elevational view thereof. 

The ornamental design for a sunken tub, as shown and described. 